Ben Harris 7364ce8e26 Make sure that moves in Flood use only valid colours
If execute_move() receieves a move that uses a colour beyond the range
for the current game, it now rejects it.  Without this a solve string
containing an invalid colour would cause an assertion failure: "fill:
Assertion `oldcolour != newcolour' failed."  While I was in the area I
put a range check on colours for normal moves as well.  To demonstrate
the problem, load this save file:

SAVEFILE:41:Simon Tatham's Portable Puzzle Collection
VERSION :1:1
GAME    :5:Flood
PARAMS  :7:6x6c6m5
CPARAMS :7:6x6c6m3
DESC    :39:432242034203340350204502505323231342,17
NSTATES :1:2
STATEPOS:1:2
MOVE    :2:S6
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This is the README accompanying the source code to Simon Tatham's
puzzle collection. The collection's web site is at
<https://www.chiark.greenend.org.uk/~sgtatham/puzzles/>.

The puzzle collection is built using CMake <https://cmake.org/>. To
compile in the simplest way (on any of Linux, Windows or Mac), run
these commands in the source directory:

  cmake .
  cmake --build .

The manual is provided in Windows Help format for the Windows build;
in text format for anyone who needs it; and in HTML for the Mac OS X
application and for the web site. It is generated from a Halibut
source file (puzzles.but), which is the preferred form for
modification. To generate the manual in other formats, rebuild it,
or learn about Halibut, visit the Halibut website at
<https://www.chiark.greenend.org.uk/~sgtatham/halibut/>.
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Readme 26 MiB
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